Table 3.

Effect of diet complexity and threonine supplementation on growth performance and fecal dry matter¹

	Complex		Simple			P-value2
Item	STD Thr	SUP Thr	STD Thr	SUP Thr	SEM	Diet	Thr	Diet × Thr
No. of animals	8	8	9	7
Body weight, kg
Day 0	7.2	7.2	7.2	7.3
Day 7	8.9	8.7	8.4	9.0	0.35	0.863	0.536	0.235
Day 14	12.7	12.8	11.8	13.0	0.65	0.507	0.286	0.373
Average daily gain, g/d
Day 0 to 7	241	213	172	239	32.2	0.469	0.529	0.120
Day 7 to 14	548	591	477	563	49.7	0.288	0.172	0.644
Day 0 to 14	395	402	324	401	38.1	0.318	0.246	0.334
Average daily feed intake, g/d
Day 0 to 7	320	294	247	307	32.4	0.316	0.579	0.164
Day 7 to 14	630	651	542	604	52.3	0.172	0.404	0.677
Day 0 to 14	475	473	395	455	40.3	0.198	0.445	0.404
Gain to feed ratio, g/g
Day 0 to 7	0.74	0.71	0.69	0.77	0.053	0.988	0.628	0.278
Day 7 to 14	0.87	0.90	0.88	0.94	0.032	0.461	0.171	0.721
Day 0 to 14	0.83	0.84	0.82	0.88	0.029	0.539	0.186	0.500
Fecal dry matter, %
Day 0 to 7	31.8	31.6	33.2	37.6	1.55	0.017	0.161	0.137
Day 7 to 14	44.3	42.0	44.1	45.4	2.90	0.551	0.861	0.513
Day 0 to 14	37.9	36.5	38.7	41.4	1.90	0.125	0.718	0.253

¹STD Thr, the standard NRC (2012) level of SID Thr (0.79%); SUP Thr, 15% over the SID Thr requirement.

²Diet, main effect of diet complexity; Thr, main effect of the levels of dietary Thr supplementation; Diet × Thr, interactive effect of diet complexity and Thr supplementation.